import java.util.Stack;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 62536
 * Date: 2024-02-18
 * Time: 16:30
 */
public class MyQueue {
    private Stack<Integer> s1;
    private Stack<Integer> s2;

    public MyQueue() {
        s1 = new Stack<>();
        s2 = new Stack<>();

    }

    public void push(int x) {
        s1.push(x);
    }

    public int pop() {
        if(empty()){
            return -1;
        }
        if(s2.isEmpty()){
            while(!s1.isEmpty()){
                s2.push(s1.pop());
            }

        }
        return s2.pop();
    }

    public int peek() {
        if(empty()){
            return -1;
        }
        if(s2.isEmpty()){
            while(!s1.isEmpty()){
                s2.push(s1.pop());
            }

        }
        return s2.peek();

    }

    public boolean empty() {
        return s1.isEmpty() && s2.isEmpty();
    }
}
